The winding data for three different alternators are as follows 1. 60 slots, four poles, span 1 to 9 II. 120 slots, six poles, span 1 to 16 III. 144 slots, eight poles, span 1 to 11 The windings having a pitch factor less than 0.9 are O a. Il and III only O b.I and Il only O c.I, Il and II. d. I and II only

The winding data for three different alternators are as follows 1. 60 slots, four poles, span 1 to 9 II. 120 slots, six poles, span 1 to 16 III. 144 slots, eight poles, span 1 to 11 The windings having a pitch factor less than 0.9 are O a. Il and III only O b.I and Il only O c.I, Il and II. d. I and II only

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter7: Alternating Current, Power Distribution, And Voltage Systems

Section: Chapter Questions

Problem 7RQ

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Concept explainers

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

The winding data for three different alternators are as follows
I. 60 slots, four poles, span 1 to 9
ed
dout of
II. 120 slots, six poles, span 1 to 16
III. 144 slots, eight poles, span 1 to 11
The windings having a pitch factor less than 0.9 are
O a. Il and III only
O b. I and Il only
O .I, Il and II.
Od.l and III only

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